Internal-combustion engine



Sept. '18, 1928. 1,684,910

- E. C. COOPER INTERNAL COMBUST ION ENGI NE Filed Oct; 9, 1-925 Jwwwto o Erwin C, Cooper latented Sept. 18, 1928.

UNITED STATES sATE NT OFFICE.

ERWIN o. coornn, or DETROIT, merrier-in, Assrenon To imc mnn MOTOR OAR. COMPANY, OF DETROIT, MICHEGAIT, A oonronnTroiv or MICHIGAN.

INTERNAL-COMBUSTION ENGINE.

Application filed October 9, 1925. 'serial 110.61,.575.

This invention relates to internal combustion engines and particularly topump mechanism therefor.

One of the objects of the invention is to provide an oil pump for internal combustion engines in which the air may be quickly exhausted from the chamber from which the pump draws its oil.

Another object of the invention to pro- ,vide means for quickly freeing the oil system of air. 7 p Another object of the invention is to provide an air vent to the intake side of a pump for quickly exhausting the air from the chamher from which the pump draws its supply.

, Other objects of the invention will appear from the following description taken in connection with the drawings, which form a part of this specification and in WlllCll} The one figure of the drawings is a sectional view through an engine crankcase and a pump therein made in accordance with this invention.

crank case of an internal combustion or other engine and 11 is a cover which, with the opening 12 in the crank case, forms a depression 13 in the lower part of the crank case into which the oil collects. 1 1 is a pump preferably of the gear type, one of the gears 15 being shown in elevation in the drawlng. This pump is supported by its flange 16 on a part 17 ofthe crank case, and a vertical shaft 18 is connected to one of the gears of the pump and forms the driving means therefor. The intake side of the pump isindlcated at 19 and the outlet or pressure side is shown at 20, and the pipe 21 connects the pressure side of the pump to the various bearings of the engine for supplying lubricant thereto under pressure. p

The section through the pump is taken to show the various ports and chambers of the pump and not to illustrate the exact construction which provides for insertion and removal of the gears, which is immaterial as far as this invention is concerned. As a matter of fact, one of the gears of the pumpis removed upwardly and one is removed downwardly through suitable openings provided therefor. Means forming an intake from the lower partof the crankcase and preferably beneath the pnump is shown in the form of a member 22 which is connected to the lower part of the pump and which has a guard 23,

Referring to the drawing, 10 represents thepreferably of cylindrical form, connected to i is formed in the member 22 and extends from thejintake 19 ,of the pump to the lower part of the chamber26 formed by the guard 23.

Thus the pump draws its oil fromthe lower 7 part of the chamber 26.

he pump is also provided with an over flow from its pressure side20i A port 27 is controlled by a ball valve 28heldto its seat by a spring29 whichis adjustable by a nut 30 and a lock nut 31. n An opening 32 permits the overflow oil from the port 27 to pass back into the chamber 26. In this. manner the maximum pressure in the pipe line 21 is controlled by this overflow valve.

In the pump construction and arrangement described above, it has been found that or) duit means in the form of a pipe25 which under some conditions air collects in the V chamber 26 when the engine is stopped and it takes some time to get the air out due to the location of the intake 25 in the lower part of the chamber. This presence of air in the system causes the pump to act noisily which is very objectionable in the use of the engine in a motor vehicle. For the purpose of quickly freeing the chamber of this entrapped air'and thus at once quieting the oil system, a vent is provided in the form of a relatively small conduit 33 extending from the upper part of the chamber 26 to the intake side 19 of the pump. As shown, this conduit 33 is drilled through the upper wall of the member 22 and through the casing parts of the pump 14. It preferably extends, to the. upper part of the intake 19 so that the air is at once passed through the pump and into the pipe line 21 and expelled through the bearings of the engine. At the same time this does not in any way interfere with the operation of the pump after the air has been expelled.

While I have herein described in some detail a specific embodiment of my invention,

Q a r 1,684,910

to be understood that my invention limited to the exact details of the construction, as it will be apparent that changes may be made therein Without departing froin the spirit or scope of my invention.

Having thus described my invention, What I claim and desire to secure by Letters Patrent is:

1. In an internal combustion engine,the combination with the crank case, of an oil pump mounted in the crank case and having a downwardly extending guard IOIITl'iIl a chamber beneath the pu1f11p,'theintal:e of the pump being near the lower part of said,

chamber, and meansforining a relatively small passage from the u er part a: "said chamber to the intake side of "the ump;

2. In an-internal combustion engine, the combination with the crankcase, of an oil pump mounted inthe crank case and having a lower part ofsaid chamber, and meansform ing a relativelysmall passage from the upperpait di saidchamber to the intake side of said pump.

4; In a pump mechanism, the combination of apuinp, a sappiiy chamber therefor hermany closed at its up er and, normally open intake means for said pump from both the uyiperafidth lower ends of said chamber.

5. In an internal combustion engine, the combination 'tvi'tlithe crank case having a dec'r'ank case" having a guard extending into said de r'ession and forming a chamber beneath tie pump, lntake conduit means connecting the intake side of said pump with the lower part of said chamber, valve overflo'w' means mm he pressure side of said pi'impto'said chamber, and vent means from the upper part of said chamber to the intake side ofs'aid pump. v y

6. In an internal coifilitistion engin'e, the combination with the crank case, of oil enter the chamber from the lower art of the crank case, intake conduit mea s from the intake side 0': said p'um extending into the lower artof said chani er, maven-t means,

from t 'e upper part of said chamber to the intakeside of saidpuinp, r V

Intestimony where f La fl x i vsi "ature;

m wmc. coo ER. ,7

40 I pression. therein, of a pump mounted in said pump indu'fit'ed therein, means forming a chamber open atthe bottoin whereby oil can 

